Multi-satellite link is – according to article 1.114 of the International Telecommunication Union´s (ITU) ITU Radio Regulations (RR) – defined as «A radio link between a transmitting earth station and a receiving earth station through two or more satellites, without any intermediate earth station. A multi-satellite link comprises one up-link, one or more satellite-to-satellite links and one down-link.»
Each station shall be classified by the service in which it operates permanently or temporarily.
References
Multi-satellite link Wikipedia(Text) CC BY-SA